منابع مشابه
baryon - antibaryon production in two - photon collisions
We study baryon pair production in two-photon collisions, γγ → BB̄, within perturbative quantum chromodynamics, treating baryons as quark-diquark systems. We extend previous work within the same approach by treating constituent-mass effects systematically by means of an expansion in the small parameter (mass/photon energy). Our approach enables us to give a consistent description of the cross se...
متن کاملTwo-Photon Annihilation into Baryon-Antibaryon Pairs
We study the handbag contribution to two-photon annihilation into baryon-antibaryon pairs at large energy and momentum transfer. We derive factorization of the process amplitude into a hard γγ → qq subprocess and form factors describing the soft qq → BB transition, assuming that the process is dominated by configurations where the (anti)quark approximately carries the full momentum of the (anti...
متن کاملBaryon stopping and strange baryon / antibaryon production at SPS energies
The amount of proton stopping in central P b + P b collisions from 20 – 160 A·GeV as well as hyperon and antihyperon rapidity distributions are calculated within the UrQMD model in comparison to experimental data at 40, 80 and 160 A·GeV taken recently from the NA49 collaboration. Furthermore , the amount of baryon stopping at 160 A·GeV for P b + P b collisions is studied as a function of centra...
متن کاملBaryon-antibaryon production by disordered chiral condensates.
We investigate the production of baryons and antibaryons in the central rapidity region of high energy nuclear collisions within the framework of the Skyrme model taking into account the effects of explicit chiral symmetry breaking. We argue that the formation of disordered chiral condensates may lead to enhanced baryonantibaryon production at low transverse momentum.
متن کاملBaryon-baryon and baryon-antibaryon interaction amplitudes in the spin–momentum operator expansion method
Partial wave scattering amplitudes in baryon-baryon and baryon-antibaryon collisions and amplitudes for the production and decay of baryon resonances are constructed in the framework of the spin-momentum operator expansion method. The approach is relativistically invariant and it allows us to perform combined analyses of different reactions imposing analyticity and unitarity directly. The role ...
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ژورنال
عنوان ژورنال: Progress of Theoretical Physics
سال: 1970
ISSN: 0033-068X
DOI: 10.1143/ptp.43.769